Olympus cameras can be set to use a 1/8s anti-shock delay. This really eliminates the shutter shock.

Sure the E-M5 has a bit less shutter shock than the E-P5 according to most users but it definitely still has some and 1/8s delay solves the problem. THe E-M1 also has the problem but it now has a new feature to keep the shutter open at the expense of higher power consumption.